They way i do with graphical Equalizer is taking a very small curve ( the Q factor set to smallest ), curve set to low volume and "cruising" with it through the whole frequency band while listening. If you reach an area with bad frequencys you really can recognize it.
That ties in to something I wanted to add..
that´s what i meant, usually i use some hard setting of the EQ just to find out the bad areas, on the final master is use as less EQ as i can.
and i use the bass roll-off on the CA-9100, protects oversteering bass and rumbling good during the record... at the older gear i used before with no roll-off feature i did it in post with a low shelv filter set around 60 to 70 Hertz. I can´t tell THE frequency you have to do it´s a bit of experimenting, depending on the conditions where you taped. Even a single location can sound different in case which band plays there or who has the hands on the board.
and protect yourself against mixing to bad, it takes lots concentration of your ears so more then an hour isn´t useful. Save it as a project file in Cubase or similar and trying again after let it asleep for a day is better.